Last modified: Feb. 22, 2021, 2 p.m.
A common species throughout Belgium.
See also bladmineerders.be
The young larva makes a circular blotch mine in the leaves of trees or shrubs. Later instars drop to the ground in a case cut from the blotch. This case is subsequently replaced by a bivalved one made from two oval pieces of dead leaf. The caterpillar then eats dead leaves. It hibernates fully-fed in that case. Pupation in early spring in the case amongst leaf-litter.
The moths are active during the day.
One generation a year: from late April till the end of May.